Printing-plate holder



E. E. STRAWN.

PRINTING PLATE HOLDER.

APPLICATION FILED IAN. 31. 1921.

1,392,896. Patehted 0ct.4,1921.

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, Application filed January 31, 1921.

To all whom 2'25 ma concern-.-

7, signedto travel at a More particularly my invention relates to a holderjfor printing plates, which is of comparativelythin and light material, the

' parts being so'arranged that theprinting invention consists in the fullyset forth, "and illustrated in the accompanying drawings, in'Which:

*f'Figure 1 is aside elevation of a printing thereon.

plate may be held flat against thesurface of the printing roller and at thesa ne time under tension. Y stillanother object of my deviceis to pro vide a printing roller having means thereon adapted to engage a pi-inting plate, part of said means being capable movement so that when a printing plate is placed thereon, it maybe moved for drawing the printing plate taut'and against the surfac of the printing roller. V

Still another object is to provide pins on a printing roller for engaging a printing plate and for holding it thereon aga nst ,acciden'tal displacement, a part of said p ns being adjustable, so that after the printing plate'is placed in position, sa d pins may be adj'uste'd for drawing the printing plate against the surface of the printing roller, and each of said pinshaving one of'its sides tapered, so as: toprevent the IGII IOVQhOf the printing plates when the pins are in one position. 1 H *With these and other objects n view, my

construction, arrangement and combination of the various parts of'iny device, whereby'the objects contemplated' are attained, as hereinafter more pointed out in my claims,

roller with my improved device shown OF DES MOINES, IOWA, ASSIGNOR OF DES MOINES, IOWA; A CORP Specification of Letters Patent.

of longitudinal I PRINTING-PLATE HOLDER.

Serial No. 44

big.

ing the tapered In" th used the ordinary printing with a shaft 11.

provided at each of i I One end of the to the shoulder 12 i nular groove 13, s portion 14, in whi of se ment members 15. The segment inen be Patented Oct. 4, 1921.

2 is an en TO THE OMNIGRA I Hi enmit ORATION.

d elevation of. the same, 1 parts being broken away and 7 tion to better illustrate the construction,

' iled, sectional view taken one of the adjustable shown insecsegment mem engagement with a printical, sectional view taken through one of the segment members, showroller whi side of the pin. e accompanying drawings, 7

reference numeral 10 to indicate an I have ch is provided he printing roller 10 is 0. ch is receiv surfaces flush with the outer main body portion of and have their inner the outer surface 14. The segment width than the width illustrated in Figs In order to hold th in the groove 13,

ts ends with a shoulder printing roller adjacent s provided with i as to form a contracted ed a plurality rs 15 have their outer surface of the the printing roller 10 surfaces, rest against of the contracted portion members 15 are of less vices 16, which are provided threaded portion tion18 at their inner ends.

portion 18 is received in an the wall of the groove 13. p V The bolt-l6 adjacent to the screw-threaded portion 17 is enlarged port on 2 opening 21 forme groove l3. A head 21'isfornied treine outer provided with O, which is and a contracted of the groove 13, as nd 3 of the drawings. e segment members 15 'iave' provided bolt dewith a screwpor The contracted opening 19 v in I slightly received in an din the outer wallof the on the exend of the'bolt 18 and'the head is provided with a series ofsinall openings hire, which may 22'adaptedto receive one end of a pin or the serve as a lever forrotating the bolt 16 within its bearings. The segment members. 15

I are provided w th a screw-threaded opening 23, which receives the sc'rew threa dedportion I'Toff the 130113 '16;

'i From the construction of described, fit 'will be seen th the parts just at rotation "of the bolt devices 16 will cause the segment members to be slid longitudinally within-the groove 13. r

a It will beunderstood that while I have only shown one of the segment members 15 described.

fixed in the printing roller 10. Each of the On the opposite end of the printing roller 10 from the groove 13, I have provided a series of pins 24, which are permanently segment members 15 is provided with a pair of pins 25, which have one of their sides tapered, as at 26.

The pins 24: and 25 are similar in construction, each havingthe tapered sides 26.

Printing plates 27 are designed to be received on the printing roller 10 and toenprinting plate openings 28 near gage the pins 24 and 25 for holding them onto the printing roller 10.

The printing plates 27 areprovided with their ends, which receive the upper ends of the pins 24 and 25.

'It will be understood that the printing plates 27 are of comparatively thin and light material, so that the printing desired to be done may be easily formed or pressed in the plates, so that. they will print upon paper when brought into contact therewith. By making the printing plates 27 of lightmaterial, it is necessary to hold the entire against the printing roller 10 in taut position, otherwise a blur would be caused, when the printing plates were brought into engagement with the paper to be printed upon. 7

In order "to engage and securely hold the printing platesin taut position, the segment members-15 are used. 7

The printing plate'27 is placed upon the printing roller; the openings 28 extending over the pins 24 and 25. Then by rotating the bolts 16, the segment member 15 is slid longitudinally within the groove, thus drawing the printing plate 27' securely between the pins 24 and 25.

It will be seen that by drawing the print ing plates 27 taut on the printing roller 10, that the entire printing plate will at all times lie against'the surface of the printing roller, thus making it possible to use a comprinting plate. 7

It will also be understood that my device is especially designed to be used -with' a and de-.

, plates there will be no play betweenthe printing roller and the printing plate when the printing plate is brought into engagement with the. article tobe printed upon.

The advantages of my device can readily be. seen, since I am ableto use a comparaplate. This enables me to have whatever is desired to be printed formed out of the thin and placed upon the printing roller.

By being able to plate and holding it infthis position at all. times, it enables me to use the thin plate for all types of work, and at a high rate of speed.

It willbe understood that any numberof printing plates or strips may be placedon the printing roller 10. In the drawings, I have just shown a part of the printing plates in position. I have also shown just two pins for engaging each of the printing plates; any number maybe used, asis desired.

tighten the printing 'tivelythin' strip of material, as a printing It will also be seen that the plates may be placed in position very'easily and quickly and removed from printing position very quickly by merely sliding the segment member 15 in either direction, as desired,

When the printing plate, has once been placed in position and tightenedpthe me pered sides 26 will positively prevent the removalof the plates 27 without first loosening the segment member 15. .7

Some changes may be made in the arrangement and construction of the various parts, of my printing plate holder, without departing from the essential features and purposes ofmy invention, and it is my in tention to cover by my claims, forms of structure or use of mechanical equivalents, which maybe reasonably included within their scope- V I claimas my invention:

any modified 1. A printing plate holder including a V printing plate and .a printing rollerhaving an annular groove in its surface, means for a screw-threaded connection with said mem ber, whereby when the parts are assembled the bolt. may be rotated to draw the plate taut on the roller. 'paratively' light strip of material for the 2. In a deviceof the class describe d, a

,printingfroller havingfan annular groove nearone/of its ends, pins printing roller near its opposite end, a screw-threaded bolt'journaled inthe walls of said groove, a member mounted on, said screw-threaded boltand in .said groove, said member being capable of movement longitudinally, pins mounted on said member, a

mounted in said groove having means for printing plate of thin material adapted to engage the pins on said printing roller and on said member, the parts being so arranged that the rotation of said screw-threaded bolt will cause said member to move, Whereby the printing plate may be drawn taut upon the printing roller.

3. In a device of the class described, a printing roller having an annular groove near one of its ends, pins mounted in said printing roller near its opposite end, a screwthreaded bolt journaled in the Walls of said groove, and having a head extended beyond the end of the printing roller for manually rotating it, a member mounted on said screw-threaded bolt and in said groove, said member being capable of movement longitudinally, pins mounted on said member, a printing plate of thin material adapted to engage the pins on said printing roller and on said members, the parts being so arranged that the rotation of said screw-threaded bolt will cause said member to move whereby the printing plate may be drawn taut upon the printing roller.

4. In a device of the class described, a printing roller having an annular groove near'one of its ends, pins mounted in said printing roller near its opposite end, a screw-threaded bolt journaled in the Walls of said groove, a member mounted on said screw-threaded bolt and in said groove, said member being capable of movement longitudinally, pins mounted on said member, a printing plate of thin material adapted to engage the pins on said printing roller and on said members, said pins having one of their sides tapered for preventing accidental displacement of the printing plate, the parts being so arranged that the rotation of said screw-threaded bolt will cause said members to move, whereby the printing plate may be drawn taut upon the printing roller.

5. In a device of the class described, a printing roller having an annular groove near one of its ends, pins mounted in said printing roller near its opposite end, segment members mounted in said groove and having their outer surfaces flush with the body portion of said printing roller, and their thickness less than the width of said groove, pins mounted on said segment memers, a printing plate of thin material adapted to engage said pins for holding it on the printing roller, and means whereby the segment members may be moved for holding the printing plates abutting the surface of the printing roller and at the same time taut.

Des Moines, Iowa, December 28, 1920.

ERVIN E. STRAWN. 

